Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4a8cf83ca71715…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 01:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12de2026513247e63b26506675bb3b53 SHA-1: e30c68ee5a51805344a593a4e58b790cbdab43fe SHA-256: 6f4a8cf83ca71715136b3f00ccf13da04cac49aeec43c83be4bd80dd1c0158ce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. While no scripts were extracted, the primary attack pattern involves luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/56c620948536f7d4c651ce41159aa8a5/50003169515.pdf In PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/62862139462.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc918c4d79d---77202248555.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/52081216575.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/83622175517.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079210c06247---83107311876.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/tavesenoxugamep.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/jejixisopujulo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef45999b31---80305815733.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15af86ca9---jovulolujivazixug.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/filojolamepob.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60df9c47b---25446083569.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/15646195087.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/42233557712.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/divunagapomori.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/sinujabojoxig.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083be485c27b---makivexawovakexugajaduban.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/73cf4de740cb0feebf3c3009ced310e7/kezubuzafatikaxefejewan.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/kelumodepa.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e512af4b5985cd2bbda7fbbd371d44f8/gumovufofozavimemopadazeg.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/99172817175.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pg7mo7901hmbiqgsam72d3c887/xugivilade.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/waxolituwenuzajumetokinuw.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/kupebariletepexatopa.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/getewiwid.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4e43c53fe---gobijemidoxokexasigud.pdfIn PDF document text
    • http://nensi.si/upload/file/fogosowigezanagukaninib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=must+have+past+participle+exercises+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD902 10756 bytes
SHA-256: 93e0d3d6db1817a58408ba9653ec6730503dc02c15f122bdc76969ef87163337
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 18368 bytes
SHA-256: 3ea38390ce504080f9a22a115fef0f7a0616e47528f6898b9634bdc650753e99

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